uniden980, what color is your hair? If your hair is really dark, then that is probably contributing to why the hair on your legs look so "thick." If you're fine with optical illusion as a solution, then I suggest you just dye your leg hair to a lighter color (still the same color as your natural hair, but a lighter shade). This way, they won't appear as "thick."

The natural way of going about this is lemon juice, but since I don't know what your natural hair color is, I really can't say. Lemon juice is a natural bleach.

Carl's post makes a lot of sense, however dying leg hair is pretty extreme. Your hair is a direct result of the size and shape of your hair follicle. The bigger the follicle, the thicker the hair. Also, if you have less than perfectly circular follicles, your hair may grow out more curly. Oval follicles produce curly, coarse hair. Your hair will naturally thin as you age, but short of harmful drugs, there's not much you can do to thin your hair.